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IR Spectrum01:19

IR Spectrum

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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Wide-Angle Polarization-Independent Ultra-Broadband Absorber from Visible to Infrared.

Jing Liu1, Wei Chen2, Jia-Chun Zheng1

  • 1School of Information Engineering, Jimei University, Xiamen 361021, China.

Nanomaterials (Basel, Switzerland)
|December 22, 2019
PubMed
Summary

We developed a novel multi-layer metasurface absorber achieving over 97.2% absorption across visible to mid-infrared light. This polarization-independent, wide-angle absorber shows great potential for light harvesting and thermal applications.

Keywords:
light absorptionlocalized surface plasmon resonancemetamaterialnanostructure

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Area of Science:

  • Metasurface technology
  • Plasmonics
  • Optical engineering

Background:

  • Metasurfaces offer unique optical properties.
  • Broadband and wide-angle absorbers are crucial for various applications.
  • Existing absorbers often struggle with polarization dependence and limited bandwidth.

Purpose of the Study:

  • To theoretically propose and numerically analyze a polarization-independent, wide-angle, and ultra-broadband absorber.
  • To demonstrate high average absorption rates across a wide spectral range.
  • To investigate the underlying physical mechanisms for the enhanced absorption.

Main Methods:

  • Theoretical proposal of a multi-layer metasurface structure.
  • Numerical simulations to analyze absorption performance.
  • Investigation of impedance matching and plasmon resonance effects.

Main Results:

  • Average absorption rate exceeding 97.2% from 400 nm to 6000 nm (visible to mid-infrared).
  • Absorption peak of 99.99%.
  • Performance maintained for polarization angles from 0° to 90°.
  • Stable absorption with incidence angles from 0° to 55°.
  • Demonstrated superior impedance matching compared to conventional structures.

Conclusions:

  • The proposed metasurface absorber exhibits excellent polarization-independent, wide-angle, and ultra-broadband absorption.
  • Strong localized surface plasmon resonance and superposition of resonant frequencies are key to performance.
  • The absorber holds significant potential for plasmonic light harvesting, photodetectors, thermal emitters, and infrared cloaking.